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Yz444 Tuning: Building a Monster Torque Curve
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[QUOTE="Rich Rohrich, post: 825596, member: 16241"] Every other season. I would imagine you can calculate it, I just measure it after I set the deck. LCA has no effect on the mechanical compression ratio only the dynamic.You'll have to CC the head and the piston crown to know that for sure but I would guess it would be in the 13.5-13.8 range depending on the valve cutouts and the depth of the valves themselves. If you give me your mechanical ratio and the IVC timing you are using I can help you with the dynamic compression ratio. I've had good luck with 1.875" OD 18 guage (ID = 1.77) and 1.750" OD 18 guage (ID = 1.65) head pipes . I think the OEM sizing is a bit small for the RPM range you want to run in so going a bit bigger is worth looking at. Just don't get it too big or it won't accelerate worth a damn, and don't forget that the overlap and exhaust closing will influence what works and what doesn't size wise on the exhaust. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
Yz444 Tuning: Building a Monster Torque Curve
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